A glimpse of Mr. Gryce’s crestfallen face even suggested that she had done wisely in absenting herself, since the disappointment he so candidly betrayed would surely whet his appetite for the afternoon walk.
There are no more uses of "whet" in the book.
Show samples from other sources
Because there is a force that wants you to realize your destiny; it whets your appetite with a taste of success.
Paulo Coelho -- The Alchemist
She says every time I lose it in front of the press, I only whet their appetites for more.